Knitwear anti-deformation swing drying device

Abstract

The utility model discloses a swing type drying device for anti-deformation of knitted clothes, which comprises a main box body, a front and back extending horizontal rod is fixed to the upper part of the inside of the main box body, a plurality of annular spacer sleeves are fixed to the outer side wall of the horizontal rod, a hanging annular groove is formed between every two adjacent annular spacer sleeves, the hook body of a clothes hanger is hung on the horizontal rod and is in the corresponding annular groove; the left part and the right part of the bottom surface of the horizontal support rod of the clothes hanger are both fixed with telescopic adjusting parts, the bottom end of the bottom adjusting rod of the two telescopic adjusting parts is movably connected with a bottom horizontal connecting beam through a hinge shaft, the front side and the back side of the bottom end of the bottom horizontal connecting beam are both formed with an outward horizontally extending extension, the top surface of the outer end of the extension is formed with a left and right extending outer horizontal plate part; it can hang and tighten the knitted clothes, directly blow and dry the knitted clothes, realize clothes swing drying, make the knitted clothes not easy to wrinkle or deform, and ensure the drying quality.

Description

Technical Field

[0001] This utility model relates to the field of textile processing technology, and more specifically to a swing-type drying device for knitted garments to resist deformation. Background Technology

[0002] Existing knitted garments generally refer to knitted clothes. When drying, they are prone to deformation. Therefore, they need to be stretched before drying to reduce deformation. However, some existing drying structures are drum-type drying devices, which are prone to deformation and wrinkles during drying, and their performance is not ideal. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a swing-type drying device for knitted garments to prevent deformation. It can hang up and tighten the knitted garments and directly blow them dry, realizing swing drying of the garments, making them less prone to wrinkles or deformation and ensuring the drying quality.

[0004] The solution of this utility model to the aforementioned technical problem is:

[0005] A swing-type drying device for knitted garments to resist deformation includes a main box. A transverse bar extending forward and backward is fixed to the upper part of the interior of the main box. Multiple annular spacers are fixed to the outer wall of the transverse bar. A hanging annular groove is formed between each two adjacent annular spacers. The hook of the garment hanger is hung on the transverse bar and is located in the corresponding annular groove.

[0006] Telescopic adjustment components are fixed to the left and right sides of the bottom surface of the horizontal support rod of the clothes hanger. The bottom ends of the bottom adjustment rods of the two telescopic adjustment components are movably connected to the bottom horizontal connecting beam through a hinge shaft. The front and rear sides of the bottom end of the bottom horizontal connecting beam are formed with outward horizontal extensions. The top surface of the outer end of the extension is formed with left and right extending outer horizontal plates. A bottom clamping plate is provided between the extension and the corresponding outer horizontal plate. The left and right ends of the two outer horizontal plates are movably connected to the rotating seats through a hinge shaft. An outer adjustment screw is fixed in the middle of the top surface of the rotating seat. An outer telescopic sleeve is screwed onto the outer adjustment screw. An upper clamping mechanism is installed at the top of the outer telescopic sleeve. When the clothes to be dried are hung on the clothes hanger, their bottoms are clamped between the corresponding bottom clamping plate and the bottom horizontal connecting beam, and the ends of the sleeves are clamped on the upper clamping mechanism.

[0007] An air inlet groove is formed in the middle of the right side panel of the main housing, and a material loading and unloading groove is formed in the middle of the left side panel of the main housing. The left door is hinged to the left side panel of the main housing and covers the material loading and unloading groove. An air outlet is fixed in the middle of the top surface of the top plate of the main housing, and the air outlet is connected to and aligned with the through hole in the middle of the top plate of the main housing.

[0008] Multiple connecting rods are fixed on the outer wall of the bottom clamping plate. The outer ends of the connecting rods extend out of the connecting through holes of the corresponding outer transverse plate and are fixed or formed with rotating parts. A compression spring is inserted into the connecting rod. One end of the compression spring is applied to the outer wall surface of the bottom clamping plate, and the other end is applied to the inner wall surface of the corresponding outer transverse plate. The fabric on one side of the bottom of the garment is clamped between the front or rear wall surface of the bottom clamping plate and the bottom transverse connecting beam.

[0009] The upper clamping mechanism includes an upper clamping seat fixed to the top of the outer telescopic sleeve. The front and rear parts of the top surface of the bottom plate of the upper clamping seat are formed with upwardly extending bent plate portions. A first pressing plate is inserted between the two bent plate portions. A first connecting rod is fixed on the outer side wall of the first pressing plate. The outer end of the first connecting rod extends out of the middle through hole of the corresponding bent plate portion and is formed or formed with a grip portion. A second compression spring is inserted on the first connecting rod. One end of the second compression spring is applied to the first pressing plate, and the other end is applied to the inner end face of the corresponding bent plate portion. The end of the sleeve is clamped between the first pressing plate and the corresponding bent plate portion.

[0010] A water receiving trough is placed on the top surface of the bottom plate of the main housing, and a drain pipe is connected to the side plate of the water receiving trough. The outer end of the drain pipe extends out of the lower outer wall of the right side plate of the main housing.

[0011] The telescopic adjustment component includes an upper guide sleeve, the top of which is fixed to the left and right sides of the bottom surface of the hanger. The upper part of the upper connecting rod is inserted into the upper guide sleeve, and its outer side wall is in close contact with the lower inner side wall of the upper guide sleeve. The bottom end of the spring is fixed to the top of the upper connecting rod, and the top of the spring is fixed to the bottom surface of the hanger. The spring is inserted into the upper guide sleeve.

[0012] The bottom end face of the upper connecting rod has an upwardly extending screw hole formed in the middle. The bottom adjusting rod is screwed into the screw hole. An outer sleeve is formed on the outer wall of the bottom end of the bottom adjusting rod. The lower part of the upper connecting rod is inserted into the outer sleeve, and its outer wall is tightly attached to the inner wall of the outer sleeve.

[0013] The outer wall of the outer telescopic sleeve is formed with a first outer sleeve, the bottom of the first outer sleeve extends downward, and the upper part of the rotating seat is inserted into the lower part of the first outer sleeve.

[0014] The outstanding effect of this utility model is:

[0015] It can hang and tighten knitted clothes and directly blow-dry them, achieving swing drying, making them less prone to wrinkles or deformation, and ensuring the quality of drying. Attached Figure Description

[0016] Figure 1 This is a partial structural schematic diagram of the present invention;

[0017] Figure 2 yes Figure 1 A magnified view of a portion of the image;

[0018] Figure 3 yes Figure 1 A magnified view of another part;

[0019] Figure 4 This is a partial structural diagram of the horizontal bar;

[0020] Figure 5 This is a partial sectional view of the bottom transverse connecting beam;

[0021] Figure 6 This is a partial structural diagram of the upper clamping seat;

[0022] Figure 7 This is a partial structural diagram of the gas heating device used for drying. Detailed Implementation

[0023] For example, see below. Figures 1 to 7 As shown, a swing-type drying device for knitted garments to resist deformation includes a main box 10. A transverse rod 11 extending forward and backward is fixed to the upper part of the interior of the main box 10. Multiple annular spacers 111 are fixed to the outer side wall of the transverse rod 11. A hanging annular groove is formed between each two adjacent annular spacers 111. The hook of the hanger 20 is hung on the transverse rod 11 and is in the corresponding annular groove.

[0024] Telescopic adjustment components 30 are fixed to the left and right sides of the bottom surface of the horizontal support rod of the clothes hanger 20. The bottom ends of the bottom adjustment rods 31 of the two telescopic adjustment components 30 are movably connected to the bottom horizontal connecting beam 40 through a hinge shaft. The front and rear sides of the bottom end of the bottom horizontal connecting beam 40 are formed with outwardly horizontally extending extensions 41. The top surface of the outer end of the extension 41 is formed with left and right extending outer horizontal plate portions 42. A bottom clamp is provided between the extension 41 and the corresponding outer horizontal plate portion 42. The left and right ends of the two outer transverse plates 42 are movably connected to the holding plate 43 via hinge shafts, and the center of the top surface of the rotating plate 44 is fixed with an outer adjusting screw 45. An outer telescopic sleeve 46 is screwed onto the outer adjusting screw 45. An upper clamping mechanism 47 is installed at the top of the outer telescopic sleeve 46. The clothes to be dried are hung on the clothes hanger 20, and their bottoms are clamped between the corresponding bottom clamping plate 43 and the bottom transverse connecting beam 40. The ends of the sleeves are clamped on the upper clamping mechanism 47.

[0025] An air inlet groove 12 is formed in the middle of the right side panel of the main housing 10, and a material loading and unloading groove 13 is formed in the middle of the left side panel of the main housing 10. The left door 14 is hinged to the left side panel of the main housing 10 and covers the material loading and unloading groove 13. A lock body is installed on the left door 14, and the lock body can be connected to the left side panel of the main housing 10.

[0026] An air outlet 15 is fixed in the middle of the top surface of the top plate of the main housing 10. The air outlet 15 is connected to and aligned with the through hole in the middle of the top plate of the main housing 10.

[0027] Furthermore, multiple connecting rods 431 are fixed on the outer side wall of the bottom clamping plate 43. The outer end of the connecting rod 431 extends out of the connecting through hole of the corresponding outer transverse plate part 42 and is fixed or formed with a rotating part (the connecting rod 431 and the rotating part can be directly bolted, and the screw part of the bolt is screwed onto the bottom clamping plate 43 as the connecting rod 431). A compression spring 432 is inserted into the connecting rod 431. One end of the compression spring 432 is applied to the outer wall surface of the bottom clamping plate 43, and the other end is applied to the inner side wall of the corresponding outer transverse plate part 42. The fabric on one side of the bottom of the garment is clamped between the bottom clamping plate 43 and the front or rear wall surface of the bottom transverse connecting beam 40.

[0028] Furthermore, the upper clamping mechanism 47 includes an upper clamping seat 471 fixed to the top of the outer telescopic sleeve 46. The front and rear parts of the top surface of the bottom plate of the upper clamping seat 471 are both formed with upwardly extending bent plate portions 472. A first pressing plate 473 is inserted between the two bent plate portions 472. A first connecting rod 474 is fixed on the outer side wall of the first pressing plate 473. The outer end of the first connecting rod 474 extends out of the middle through hole of the corresponding bent plate portion 472 and is formed or formed The sleeve has a gripping part (its first connecting rod 474 and the rotating part can be directly bolted, with the bolt threaded part serving as the first connecting rod 474 and screwed onto the first pressing plate 473). A second pressing spring 475 is inserted into the first connecting rod 474. One end of the second pressing spring 475 is applied to the first pressing plate 473, and the other end is applied to the inner end face of the corresponding bending plate part 472. The end of the sleeve is clamped between the first pressing plate 473 and the corresponding bending plate part 472.

[0029] Furthermore, a water receiving trough 50 is placed on the top surface of the bottom plate of the main housing 10, and a drain pipe 51 is connected to the side plate of the water receiving trough 50. The outer end of the drain pipe 51 extends out of the lower outer wall of the right side plate of the main housing 10.

[0030] Furthermore, the telescopic adjustment component 30 includes an upper guide sleeve 32. The top end of the upper guide sleeve 32 is fixed to the left and right sides of the bottom surface of the horizontal support rod of the hanger 20. The upper part of the upper connecting rod 33 is inserted into the upper guide sleeve 32, and its outer side wall is tightly attached to the lower inner side wall of the upper guide sleeve 32. The bottom end of the spring 34 is fixed to the top end of the upper connecting rod 33. The top end of the spring 34 is fixed to the bottom surface of the horizontal support rod of the hanger 20, and the spring 34 is inserted into the upper guide sleeve 32. This spring 34 can provide a certain buffer for the stretched clothes (since the clothes will shrink to a certain extent when drying, the spring 34 can ensure that the clothes can be compressed by the spring 34 when drying and thus ensure the stretched state of the clothes without causing the clothes to break due to excessive tension).

[0031] The upper connecting rod 33 has an upwardly extending screw hole formed in the middle of its bottom end face. The bottom adjusting rod 31 is screwed into the screw hole. An outer sleeve 311 is formed on the outer wall of the bottom end of the bottom adjusting rod 31. The lower part of the upper connecting rod 33 is inserted into the outer sleeve 311, and its outer wall is in close contact with the inner wall of the outer sleeve 311.

[0032] Furthermore, the outer wall of the outer telescopic sleeve 46 is formed with a first outer sleeve 1, the bottom of the first outer sleeve 1 extends downward, and the upper part of the rotating seat 44 is inserted into the lower part of the first outer sleeve 1.

[0033] Furthermore, an air guide plate 60 is fixed on the inner wall of the right side plate of the main housing 10. The air guide plate 60 covers the air inlet groove 12. An upwardly extending inner cavity 61 is formed in the middle of the bottom surface of the air guide plate 60. Multiple right through holes 62 are formed on the right side wall of the inner cavity 61. The right through holes 62 communicate with the air inlet groove 12. Multiple side through holes 63 are formed on the front and rear side plates of the inner cavity 61.

[0034] Furthermore, an air intake hood 70 is fixed on the right side wall of the right side panel of the main housing 10. The air intake hood 70 communicates with the air intake channel 12. An air intake connector 71 is connected to the middle of the right end face of the air intake hood 70. A temperature sensor 72 is fixed on the side panel of the air intake hood 70. The sensing end of the temperature sensor 72 extends into the air intake hood 70.

[0035] Furthermore, an exhaust pipe 80 is screwed to the top of the exhaust pipe 15, and an upper cover plate 81 is fixed to the top of the exhaust pipe 80. An upwardly extending sleeve portion 811 is formed in the middle of the top surface of the upper cover plate 81. A floating plate 82 is inserted into the sleeve portion 811, and its outer side wall is close to or near the inner side wall of the sleeve portion 811. The bottom surface of the floating plate 82 covers the through hole formed in the middle of the upper cover plate 81. Multiple vertical through holes are formed on the upper cover plate 81 around the through hole. Multiple adjusting bolts 83 are screwed to the bottom edge of the floating plate 82. The screw portion of the adjusting bolt 83 is inserted into the vertical through hole, and its bottom end extends out of the bottom end of the vertical through hole and is formed with a rotating part. An upper compression spring 84 is inserted into the screw portion of the adjusting bolt 83. The bottom end of the upper compression spring 84 is applied to the top surface of the rotating part at the bottom of the adjusting bolt 83, and the top end of the upper compression spring 84 is applied to the bottom surface of the upper cover plate 81.

[0036] Multiple side through holes are formed on the side wall of the sleeve part 811.

[0037] In this embodiment, the air inlet connector 71 can be connected to the air outlet connector of the gas heating device for drying via a connecting pipe.

[0038] The gas heating device for drying in this embodiment includes a main housing, in which multiple heating rods extending forward and backward are installed. An air inlet fan is fixed on the outer wall of the main housing, and the air outlet of the air inlet fan communicates with a through groove on the side plate of the main housing. Multiple air outlet connecting pipes are connected to the other side plate of the main housing. In this embodiment, there are three air outlet connecting pipes, which can be directly connected to the three air inlet connectors 71 of the structure of this embodiment through connecting pipes to realize air circulation.

[0039] A second temperature sensor is also fixed on the main housing, with its sensing end extending into the main housing to detect the temperature inside the main housing.

[0040] All electrical components in this embodiment are electrically connected to the control host via electrical connection lines, and are controlled by the control host. This is a conventional structure and will not be described in detail here.

[0041] When in use, hang the knitted clothes on the hanger 20. Then, by rotating the two bottom adjusting rods 31, the distance between the bottom horizontal connecting beam 40 and the hanger 20 can be adjusted to meet the hanging needs. Similarly, by rotating the outer telescopic sleeve 46, the position of the upper clamping mechanism 47 can be adjusted to meet the distance requirements for clamping the sleeves.

[0042] The front and back fabrics at the bottom of the garment are clamped between the corresponding bottom clamping plate 43 and the bottom transverse connecting beam 40 (by pulling the corresponding rotating part outward, the bottom clamping plate 43 can be pulled outward, thereby increasing the distance between the corresponding wall surfaces of the bottom clamping plate 43 and the bottom transverse connecting beam 40, thus facilitating clamping). Similarly, the bottom end of the garment sleeve can be clamped between the first pressing plate 473 and the corresponding bending plate part 472 (by pulling the corresponding rotating part outward, the distance between the first pressing plate 473 and the corresponding bending plate part 472 can be increased, thus facilitating the clamping of the sleeve end).

[0043] Then, hang it on the horizontal bar 11 and place it in the corresponding annular groove. Then, close the left door 14, and turn on the air intake fan of the drying gas heating device. The heating rod heats the gas, so that the incoming gas is heated and enters the main chamber 10. The gas is guided by the air guide plate 60, so that the gas can be discharged from the bottom of the inner cavity 61 and the side through hole 63, so that the hot air will not directly impact the clothes and reduce the deformation of the clothes. The water from the clothes can drip into the water receiving tank 50, and the excess water can be discharged from the drain pipe 51.

[0044] The second temperature sensor and temperature sensor 72 can sense the temperature of the wind at all times. If the temperature is too high (generally above 60° to 90°), some of the heating rods can be turned off. If the temperature is too low, the heating rods can be turned on more (generally, only half of the heating rods are turned on for heating when they are first turned on).

[0045] After the hot air dries the clothes, the gas can break through the floating plate 82, allowing the gas to be discharged from the sleeve part 811.

[0046] In this embodiment, the clothes are kept taut to ensure that they will not wrinkle or deform during drying, thus guaranteeing the drying effect.

[0047] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A swing type drying device for anti-deformation of knitted apparel, comprising a main box (10), characterized in that: The upper part of the interior of the main box (10) is fixed with a horizontal bar (11) extending forward and backward. Multiple annular sleeves (111) are fixed on the outer side wall of the horizontal bar (11). A hanging annular groove is formed between each two adjacent annular sleeves (111). The hook of the clothes hanger (20) is hung on the horizontal bar (11) and is in the corresponding annular groove. Telescopic adjustment components (30) are fixed to the left and right sides of the bottom surface of the horizontal support rod of the hanger (20). The bottom ends of the bottom adjustment rods (31) of the two telescopic adjustment components (30) are movably connected to the bottom horizontal connecting beam (40) through the hinge shaft. The front and rear sides of the bottom end of the bottom horizontal connecting beam (40) are formed with outward horizontal extensions (41). The top surface of the outer end of the extension (41) is formed with left and right extending outer horizontal plate portions (42). A bottom clamping plate is provided between the extension (41) and the corresponding outer horizontal plate portion (42). (43) Rotating seats (44) are movably connected to the left and right ends of the two outer transverse plates (42) via hinge shafts. An outer adjusting screw (45) is fixed in the middle of the top surface of the rotating seat (44). An outer telescopic sleeve (46) is screwed onto the outer adjusting screw (45). An upper clamping mechanism (47) is installed at the top of the outer telescopic sleeve (46). The clothes to be dried are hung on the clothes hanger (20), and their bottoms are clamped between the corresponding bottom clamping plate (43) and the bottom transverse connecting beam (40). The ends of the sleeves are clamped on the upper clamping mechanism (47). An air inlet groove (12) is formed in the middle of the right side plate of the main box (10), and a material loading and unloading groove (13) is formed in the middle of the left side plate of the main box (10). The left door (14) is hinged to the left side plate of the main box (10) and covers the material loading and unloading groove (13). An air outlet cylinder (15) is fixed in the middle of the top surface of the top plate of the main box (10). The air outlet cylinder (15) is connected to and aligned with the through hole in the middle of the top plate of the main box (10).

2. The oscillating drying device for anti-deformation of knitted apparel according to claim 1, characterized in that: Multiple connecting rods (431) are fixed on the outer side wall of the bottom clamping plate (43). The outer end of the connecting rod (431) extends out of the connecting through hole of the corresponding outer transverse plate (42) and is fixed or formed with a rotating part. A compression spring (432) is inserted on the connecting rod (431). One end of the compression spring (432) is applied to the outer wall surface of the bottom clamping plate (43), and the other end is applied to the inner side wall of the corresponding outer transverse plate (42). The fabric of the bottom of the garment is clamped between the front wall surface or the back wall surface of the bottom clamping plate (43) and the bottom transverse connecting beam (40).

3. The oscillating drying device for anti-shrinking of knitted apparel according to claim 1, characterized in that: The upper clamping mechanism (47) includes an upper clamping seat (471) fixed to the top of the outer telescopic sleeve (46). The front and rear parts of the top surface of the bottom plate of the upper clamping seat (471) are formed with upwardly extending bending plate parts (472). A first pressing plate (473) is inserted between the two bending plate parts (472). A first connecting rod (474) is fixed on the outer side wall of the first pressing plate (473). The outer end of the first connecting rod (474) extends out of the middle through hole of the corresponding bending plate part (472) and is formed or formed with a gripping part. A second compression spring (475) is inserted on the first connecting rod (474). One end of the second compression spring (475) is applied to the first pressing plate (473), and the other end is applied to the inner end face of the corresponding bending plate part (472). The end of the sleeve is clamped between the first pressing plate (473) and the corresponding bending plate part (472).

4. The oscillating drying device for anti-shrinking of knitted apparel according to claim 1, characterized in that: A water receiving trough (50) is placed on the top surface of the bottom plate of the main box (10), and a drain pipe (51) is connected to the side plate of the water receiving trough (50). The outer end of the drain pipe (51) extends out of the lower outer wall of the right side plate of the main box (10).

5. The oscillating drying device for anti-shrinking of knitted apparel according to claim 1, characterized in that: The telescopic adjustment component (30) includes an upper guide sleeve (32), the top of which is fixed to the left and right sides of the bottom surface of the horizontal support rod of the hanger (20). The upper part of the upper connecting rod (33) is inserted into the upper guide sleeve (32), and its outer side wall is close to the lower inner side wall of the upper guide sleeve (32). The top of the upper connecting rod (33) is fixed with the bottom end of the spring (34), the top of which is fixed to the bottom surface of the horizontal support rod of the hanger (20), and the spring (34) is inserted into the upper guide sleeve (32). The upper connecting rod (33) has an upwardly extending screw hole formed in the middle of its bottom end face. The bottom adjusting rod (31) is screwed into the screw hole. An outer sleeve (311) is formed on the outer side wall of the bottom end of the bottom adjusting rod (31). The lower part of the upper connecting rod (33) is inserted into the outer sleeve (311), and its outer side wall is in close contact with the inner side wall of the outer sleeve (311).

6. The oscillating drying device for anti-shrinking of knitted apparel according to claim 1, wherein: The outer wall of the outer telescopic sleeve (46) is formed with a first outer sleeve (1), the bottom of the first outer sleeve (1) extends downward, and the upper part of the rotating seat (44) is inserted into the lower part of the first outer sleeve (1).

7. The oscillating drying device for anti-shrinking of knitted apparel according to claim 1, characterized in that: An air guide plate (60) is fixed on the inner wall of the right side plate of the main housing (10). The air guide plate (60) covers the air inlet groove (12). An upwardly extending inner cavity (61) is formed in the middle of the bottom surface of the air guide plate (60). Multiple right through holes (62) are formed on the right side wall of the inner cavity (61). The right through holes (62) communicate with the air inlet groove (12). Multiple side through holes (63) are formed on the front and rear side plates of the inner cavity (61).

8. A swing-type drying device for knitted garments to resist deformation according to claim 1, characterized in that: An air intake hood (70) is fixed on the right side wall of the right side plate of the main housing (10). The air intake hood (70) is connected to the air intake channel (12). An air intake connector (71) is connected to the middle of the right end face of the air intake hood (70). A temperature sensor (72) is fixed on the side plate of the air intake hood (70). The sensing end of the temperature sensor (72) extends into the air intake hood (70).

9. A swing-type drying device for knitted garments to resist deformation according to claim 1, characterized in that: An exhaust pipe (80) is screwed to the top of the exhaust pipe (15). An upper cover plate (81) is fixed to the top of the exhaust pipe (80). An upwardly extending sleeve portion (811) is formed in the middle of the top surface of the upper cover plate (81). A floating plate (82) is inserted into the sleeve portion (811), with its outer side wall close to or near the inner side wall of the sleeve portion (811). The bottom surface of the floating plate (82) covers the through hole formed in the middle of the upper cover plate (81). The upper cover plate (81) around the through hole is formed with... Multiple vertical through holes are provided. Multiple adjusting bolts (83) are screwed onto the bottom edge of the floating plate (82). The screw part of the adjusting bolt (83) is inserted into the vertical through hole. Its bottom end extends out of the bottom end of the vertical through hole and is formed with a rotating part. An upper compression spring (84) is inserted into the screw part of the adjusting bolt (83). The bottom end of the upper compression spring (84) is applied to the top surface of the rotating part at the bottom of the adjusting bolt (83). The top end of the upper compression spring (84) is applied to the bottom surface of the upper cover plate (81). The sleeve part (811) has multiple side through holes formed on its side wall.

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